Allow updating arc widget bounds in maximize/fullscreen state.

ash/common/wm/window_state.h

Index: ash/common/wm/window_state.h
diff --git a/ash/common/wm/window_state.h b/ash/common/wm/window_state.h
index db48217669be7f998a799680a29f15644cfdce66..9d4eaac8c23ad95a1c594893277dd5ef5852658f 100644
--- a/ash/common/wm/window_state.h
+++ b/ash/common/wm/window_state.h
@@ -289,6 +289,15 @@ class ASH_EXPORT WindowState {
     ignore_keyboard_bounds_change_ = ignore_keyboard_bounds_change;
   }
 
+  // True if the window's bounds can be updated using SET_BOUNDS event in
+  // maiximzed/fullscreen mode.
+  void set_allow_set_bounds_in_maximized(bool value) {
+    allow_set_bounds_in_maximized_ = value;
+  }
+  bool allow_set_bounds_in_maximized() const {
+    return allow_set_bounds_in_maximized_;
+  }
+
   // Creates and takes ownership of a pointer to DragDetails when resizing is
   // active. This should be done before a resizer gets created.
   void CreateDragDetails(const gfx::Point& point_in_parent,
@@ -375,6 +384,7 @@ class ASH_EXPORT WindowState {
   bool minimum_visibility_;
   bool can_be_dragged_;
   bool cached_always_on_top_;
+  bool allow_set_bounds_in_maximized_ = false;
 
   // A property to remember the window position which was set before the
   // auto window position manager changed the window bounds, so that it can get